Sunday, July 19, 2009

There are times when new technologies are proposed as being better ways of drilling for oil and natural gas. However, to understand how these are better (or more likely not) than existing technologies, you have to know how the industry commonly drills through rock. There are two basic ways of doing so, depending on how hard the rock is. The first is the one that made the Hughes family very rich (if you ever saw the film The Aviator, Howard Hughes extravaganzas were paid for because his father had invented an effective way of drilling oil wells). The other, somewhat slower, was developed the last time that we had an energy crisis, and uses artificial diamonds, in the main, to gouge into and scrape off thin layers of rock.

I am going to borrow a bit from a post I made at TOD four years ago, this week, to explain a little about how the first one works, and then come back in a week or so to describe the idea behind the other one. Starting therefore with the Hughes bit, which, for reasons that I will explain, is usually referred to as a tri-cone bit.The three cones of a tricone bit To start one can go back to the mining industry (can we call it one of the older professions) where holes were drilled, until about a hundred years ago, by taking a chisel in one hand and holding a hammer in the other with which one whacked the upper end of the chisel as it was held against the rock. This is called hand steeling and if you want to try it or see it, there is a video here and student competitions at various places. A skilled miner can drill a 1-inch hole at the rate of about 8 inches in five minutes, using a 4-lb hammer.

Now what he does (if you watch the video you will see this) is to hit the chisel, turn it about a quarter turn between blows, and then hit it again. The turning is the critical bit. Because when you hit the chisel it crushes the rock directly underneath it, but the wedge head pushes sideways against the rock on either side. So if the driller turns the chisel between blows he will not only crush the rock, but will also chip out the thin layer between the second blow and where the first hit. This removes a lot more rock for the same amount of energy. In fact it is the skill of the driller that will make bigger chips, for less muscle power, by turning the bit, rather than using brute force to crush the rock just under the chisel into powder. (On a larger scale the same idea is used to drill very large tunnels. Bit disks roll over the surface of the rock crushing the rock immediately below them, but the rock in the inches of spacing to the next disk spalls out of the face without direct contact with the tool).

When it came time to drill the first oil wells this was the technique that they used. Except that they made the chisel much larger and heavier, so that, by lifting it and dropping it, it's own weight would act as the hammer. Normally a larger spudding bit was used first to make a larger diameter hole from 4 to 22 inches in diameter, and down for 50 ft or more. Once this starting hole had been drilled (using a cable over the derrick to a crank to raise and drop the bit) a steel pipe was lowered into the hole and cemented in place. This pipe provided a base for the deeper hole, and provided a case around it. Thus it became known as casing, and it protected the hole as it went through the top soil and weakest of the upper layers of the ground.

Once the hole had been spudded-in, and this initial conductor pipe installed, then the normal sections of steel tubes could be strung together to form a pipe (hence the name drill string), and the drilling bit (in those days around 4 to 5 inches across) would be raised and dropped by a walking beam engine. As the hole was drilled they would stop, perhaps every couple of feet, to pull the bit out, and sharpen it, and to bail the crushed rock or cuttings, out of the hole.

Progress was, as you can imagine, slow, and this tool is very difficult to steer, particularly as the drill goes down several hundred feet. And so the industry was ripe for a better way of drilling.

This was invented by the older Howard Hughes who realized that if very small chisel shapes could be set around a roller they would do the same thing as the dropping bit, but could be moved around by rolling, and pushed into the rock by the weight of the connecting rods to the surface. To spread the load over the face of the hole, and to balance the bit, he used 2 rollers which tapered towards the center of the bit.

Hughes, along with his partner Walter B. Sharp, formed the Sharp-Hughes Tool Co. and produced a model of his new bit. Rather than sell his bits to oil drillers, Hughes and Sharp opted to lease the bits on a job basis, charging U.S. $30,000 per well. With no competitors to duplicate their drilling technology, they soon garnered the lion's share of the market. Flush with their success, the partners built a factory on 70 acres east of downtown Houston, where they turned out the roller-cone bits that quickly revolutionized the drilling process.2

This later evolved into a 3-cone assembly and what is now known as a tri-cone bit, a modern version of which is pictured above. (The shape of the teeth vary as a function of the hardness of the rock that is being drilled. As a rough rule, the tougher the rock the smaller the teeth are, and the smaller the chips that are generated).

This bit has a number of problems under different conditions (it is harder to control in directional drilling since if the pushing force varies too much it can wander off in odd directions) and there has to be a way of getting the rock out of the hole. These have led to other drilling ideas, and I will discuss these, and the second “diamond bit” drilling idea in later posts.

But as you watch the movie "The Aviator" remember that all those shenanigans were paid for with the money that came from that drilling bit, and that Hughes (the company) is still reported to have 40% of the world market share of oilwell drill bits.

Waterjetting Index

After writing about Waterjet Technology for a couple of years at this site I have created an index, hopefully this will be updated monthly and can be found at: Waterjet Index .

The Archive of Oil and Gas and Coal Posts

About ten years ago I began to write a blog, and after a time that transformed into co-founding The Oil Drum. Move on a few years, and at the end of 2008 I turned from being an editor there to this blog, although the OGPSS series continued to be posted, on Sundays, at TOD as their weekly Tech Talk. Some of the industrial technical descriptions of oilwell formation and coal mining are relatively timeless and useful, and so are listed below.

Along the way I became similarly cynical about some of the facts being bruited about Climate Change, and did a little study, which is documented here as the State Temperature Analysis Series. It showed that the UHI is real and that there is a log:normal relationship between population and temperature (which is also related to altitude and latitude). You can read the individual state studies, which are listed below. There will still be the occasional post on this topic.

Just this last year I was asked to write a weekly blog on the application of High-Pressure waterjetting – which is the subject that I specialized in for four decades.That too is now, therefore, a part of the contribution.

And, in my retirement, I have become curious about Native Americans and what they looked like.And so I am now learning Poser and related programs, and may inject both posts and the odd illustration – helped by the many real artists who work in that medium, as I read and try and comprehend what went on in the depths of The Little Ice Age (around 1600 – 1700).

Because I am a Celt, there will also be the odd post on my lineage and some of the DNA studies that relate to history.

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Units and Conversions

One of the problems in following stories in different countries is that they use different units and symbols. This can be a bit confusing, and so, where I can, I will try and standardize on the unit of barrel/day, or bd for oil. I will also use a thousand cubic ft kcf for natural gas. Prices will also be standardized, when I can, in $/kcf for natural gas, $/barrel for oil, and $/gallon for gasoline.

In larger units volumes a thousand barrels a day becomes 1 kbd and a million barrels a day becomes 1 mbd. For natural gas a million cu ft per day will be 1 mcf. (In many quotes this has appeared as 1 MMcf).

A billion cu. ft. is 1,000 mcf. Note that a cubic foot of gas produces 1,030 Btus - so to simplify 1 million Btu's is approximately 1 kcf, or 28.3 cu.m. of natural gas equivalent.

A ton of oil is 7.33 barrels. (Mainly used in Eastern Europe).

Since not all posts before this show these units - note that this change happened on March 3, 2009.